Re: [PATCH] idpf: disable PCIe PTM on device removal

["Tantilov, Emil S" <emil.s.tantilov@intel.com>]

On 7/14/2026 1:11 AM, Myeonghun Pak wrote:
> idpf_probe() enables PCIe Precision Time Measurement with
> pci_enable_ptm(pdev, NULL), which programs the PTM control bits and sets
> pdev->ptm_enabled when the bus/controller supports it.  The teardown path
> in idpf_remove() releases the workqueues, vports, mutexes and the adapter
> memory but never calls pci_disable_ptm(), so PTM is left enabled on the
> device after the driver detaches.
> 
> This leaves the PCI core's software PTM state and the device's PTM control
> bits set with no bound driver.  pcim_enable_device() only arranges for
> pci_disable_device() on teardown and does not undo the PTM enable, so it
> is not a substitute here.
> 
> Pair the enable with pci_disable_ptm(pdev) in idpf_remove(), matching the
> igc and mlx5 drivers which already disable PTM on their remove paths.
> 
> Fixes: 8d5e12c5921c ("idpf: add initial PTP support")
> Co-developed-by: Ijae Kim <ae878000@gmail.com>
> Signed-off-by: Ijae Kim <ae878000@gmail.com>
> Signed-off-by: Myeonghun Pak <mhun512@gmail.com>
> ---
>   drivers/net/ethernet/intel/idpf/idpf_main.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/intel/idpf/idpf_main.c b/drivers/net/ethernet/intel/idpf/idpf_main.c
> index 0dd741dcfc..3d3471d3f7 100644
> --- a/drivers/net/ethernet/intel/idpf/idpf_main.c
> +++ b/drivers/net/ethernet/intel/idpf/idpf_main.c
> @@ -159,6 +159,7 @@ static void idpf_remove(struct pci_dev *pdev)
>   	mutex_destroy(&adapter->queue_lock);
>   	mutex_destroy(&adapter->vc_buf_lock);
>   
> +	pci_disable_ptm(pdev);
>   	pci_set_drvdata(pdev, NULL);
>   	kfree(adapter);
>   }

I think another call will also be needed in idpf_probe() in the error 
path, following pci_enable_ptm().

Thanks,
Emil